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      1 /*	$NetBSD: compat___getmntinfo13.c,v 1.1 2019/09/22 22:59:38 christos Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2019 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Christos Zoulas.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 #include <sys/cdefs.h>
     33 #if defined(LIBC_SCCS) && !defined(lint)
     34 __RCSID("$NetBSD: compat___getmntinfo13.c,v 1.1 2019/09/22 22:59:38 christos Exp $");
     35 #endif /* LIBC_SCCS and not lint */
     36 
     37 #define __LIBC12_SOURCE__
     38 
     39 #include "namespace.h"
     40 
     41 #include <sys/types.h>
     42 #include <sys/param.h>
     43 
     44 #include <assert.h>
     45 #include <compat/sys/statvfs.h>
     46 #include <string.h>
     47 #include <stdlib.h>
     48 
     49 __warn_references(__getmntinfo13,
     50     "warning: reference to obsolete __getmntinfo13(); use statvfs()")
     51 
     52 __strong_alias(__getmntinfo13, __compat___getmntinfo13)
     53 
     54 /*
     55  * Return information about mounted filesystems.
     56  */
     57 int
     58 __compat___getmntinfo13(struct statvfs90 **mntbufp, int flags)
     59 {
     60 	static struct statvfs90 *mntbuf;
     61 	static int mntsize;
     62 	static size_t bufsize;
     63 
     64 	_DIAGASSERT(mntbufp != NULL);
     65 
     66 	if (mntsize <= 0 &&
     67 	    (mntsize = __compat_getvfsstat(NULL, 0L, MNT_NOWAIT)) == -1)
     68 		return (0);
     69 	if (bufsize > 0 &&
     70 	    (mntsize = __compat_getvfsstat(mntbuf, bufsize, flags)) == -1)
     71 		return (0);
     72 	while (bufsize <= mntsize * sizeof(struct statvfs90)) {
     73 		if (mntbuf)
     74 			free(mntbuf);
     75 		bufsize = (mntsize + 1) * sizeof(struct statvfs90);
     76 		if ((mntbuf = malloc(bufsize)) == NULL)
     77 			return (0);
     78 		if ((mntsize = __compat_getvfsstat(mntbuf, bufsize,
     79 		    flags)) == -1)
     80 			return (0);
     81 	}
     82 	*mntbufp = mntbuf;
     83 	return (mntsize);
     84 }
     85